package com.easy.util;


import cn.hutool.crypto.digest.DigestUtil;
import org.apache.tomcat.util.buf.UDecoder;

public class passwordUtil {
    private final static char[] arr={'a','b','c','d','e','f','1','2','3','4','5','6','7','8','9','0'};
    private final static int salt_index=5;
    private final static int count_index=15;
    public static String getEncryption(String password){
        //随机盐值
        int index_salt=(int)(Math.random()*arr.length);
        char salt=arr[index_salt];

        //随机加密次数
        int index_count=(int)(Math.random()*arr.length);
        char count=arr[index_count];
        String encryptionPassword=password+salt;
        for(int i=0;i<count;i++){
            encryptionPassword=DigestUtil.md5Hex(encryptionPassword);
        }

        StringBuilder strb=new StringBuilder(encryptionPassword);
        strb.insert(salt_index,salt);
        strb.insert(count_index,count);
        return strb.toString();

    }
    public static boolean checkPassword(String password,String encryptionPassword){
        //盐值
        char salt=encryptionPassword.charAt(salt_index);
        //加密次数
        char count=encryptionPassword.charAt(count_index);
        String decode=password+salt;
        for(int i=0;i<count;i++){
        decode=DigestUtil.md5Hex(decode);
        }
        StringBuilder strb=new StringBuilder(decode);
        strb.insert(salt_index,salt);
        strb.insert(count_index,count);
        return strb.toString().equals(encryptionPassword);
    }


    public static void main(String[] args) {
        System.out.println(getEncryption("123456"));
        //System.out.println(checkPassword("123456","1abc37b139bec20b1033d32fd9a1a32a0e"));
    }
}
